<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>demo_*{}</title>
    <style>
        *{
            color: red;
            margin: 0;
            padding: 0;
        }
    </style>
</head>
<body>
    <p>demo_p</p>
    <H1>demo_H1</H1>
    <div>demo_div</div>
    <span>demo_span</span>
</body>
</html>